to give us pvpers a little more variety. add a 'enter pvp mission' button right below the 'enter mission' button. change the instance so it allows a 2nd group to enter.
a message tells first group 'You are the first group to enter this instance',
when the 2nd group enters, they get a message 'another group is already here', and the first group gets a message 'another group has entered the mission'. a timer starts when the 2nd group enters the mission.
having them start at different times prevents the 'no group has challenged and reset timer stuff' also, since 1st group has to clear a lot of aggro, the 2nd group shouldn't have much trouble catching up if thats their strategy. also, depending on how far along the first group is the 2nd group could decide to simply position themselves near end of mission. opens up to lot more situational awareness and tactics.
The first group has the regular mission objective with a timer. If they complete it. anyone who hasn't completed gets the regular xp. everyone else gets 1k faction award. The 2nd group has to stop first group to get awarded 1k faction.
For those who care about the story line. Anet could have 2nd npc to tell their side and why the mission needs to be prevented. This would be pretty easy in the white mantle VS shining blade missions.
as always it would be totally optional. ppl who think that this is griefing or who just want to lvl would still have the no interference regular 'enter mission' option.
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